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The sampling equipment eanawts of a`Tedlar•bag(available The probe tip is then Lowered Into the well and sutxrierged In in 1,3,5,and 10 liter sines),a diaphragm pump,and 1144nch- the groundwater An oscWating(beeping)tone Indicates the def Polyethylene tubing(aPPmximobeh'1 foot long) probe is In water The probe is slowly raised until ettherew etherosell tom oesses;or becomes a steady tone In The sampling ports are brans connections,fitted with a silicone case, is the doWkoo-water(DT%M Indication and the DTW septa,and threaded Into a topped hole in the system piping msasraemert is., atxoordi gly The steady tone indicates The sampling procedure miuires one end of the tubby be floating bglnd hydrocarbons(FLH) In this case,the probe is slipped overthe sarriphng port and the other end overthe sloiMy raised until the steadytone ceases Thisis the depth-to- diaphragm pump to acquire an alright connection The product(DTP)Indication and the DTP measurement is made sampling pump is purged for 1 minute with the extracted vapor accordingly to be sampled FckwAng purging,the discharge of the pump Is then diverted through a two-way valve into the"Tedlet"bag, The process of b i ening and raining the probe must be which should be filled to 314 of volume capacity Caution repeated several times to ensure accurate measurements The should be taken not to overfill the sampling bag The sample Is DTW and DTP measurements are recorded on the Aquld-ievel Owed In a non-refrigerated dry coder with sufftclent pacikng to data sheet When FLH are Indicated bythe probe's response, eliminated damage during transport Coding samples will a product bailer Is loweredrtiall through pa y rough the FLH-water cause condensation of moisture within the sample,thereby interface to confirm the FLH on the water surface and as distorting iaborstoryanalysts further Indication of the FLH thickness,particuierly in cases where the FLH layer is quite thin This measurement is For quality control purposes,a duplicate vapor sample should recorded on the data sheet as"FLH thickness" be collected from each sampling port This sample Is then put on hold at the laboratory pending initial analysis To ensure In order to avoid cross-contominabon of webs during the liquid- quality control and minimize the potential for cross- level measurement process wells are measured in the order of contamahation prior to and during sampling the diaphragm "dean"to"dirty'(where such Information is available) In pump is thoroughly purged for approximately 5 minutes with addition,all measurement equipment is cleaned with solution nitrogen or leen air(I e,compressed dean air) A"blanle -and thoroughly rinsed with demnized water before use between sample of the discharged air is captured in a"Tedier bag at measurements in respective wells and at the completion of the the end of the purging procedure and may be analyzed to days use ensure the purging was effective To minimize the potential for cross-contamination between air samples the polyethylene tubing if not sample dedicated,Is thoroughly cleaned and rinsed Vapor samples are subject to very limited holding times typically 48 hours Thus care must taken to avoid delays to submittal of vapor samples to the laboratory In the event the vapor samples cannot be submitted to the analytical laboratory on the same day they are collected they are to be temporarily stored in the dry non-refrigerated,packed cooler until the very first opportunity for submittal well within the required holding time taking Into accourit the time needed for shipment to and receipt by the laboratory SOP-7 2 MEASURING LIQUID LEVELS USING WATER LEVEL. METER OR INTERFACE PRO13E Field equipment used for liquid-level gauging typically includes the measuring instrument(water-level meter or interface probe) and product bader(s) The field lit also Includes cleaning supplies(buckets,solution spray battles and deionmed water) to be used in cleaning the equipment between wells Pnor to measurement the instrument tip is lowered into the well until It touches bcdom Using the previously established top-of- casing or top-of-box(i a wellhead vault)pant,the probe cord (or halyard)is manned and a measuring tape(graduated in hundredths of a foot)is used to determine the distance between the probe end and the marling on the cord This measurement is then recorded on the liquid-level data sheet as the"Measured Total Depth"of the well When necessary in using the interface probe to measure liquid levels the probe is first electrically grounded to other the metal stove pipe or another metal object nearby When no ground is available reproducible measurements can be obtained by clipping the ground lead to the handle of the Interface probe case Page 2-SOP Operation&Maintenance